Firstly, thanks to Gyrobot for designing and printing these out. Heath Company began the HERO 1 project in October 1979. The first units were available in 1982. This is a real blast from the past and a credit to the technology available at the time. The R2D2 of its day. This is an stl for a replacement wrist connection on the end of the robotic arm. This item was printed off for the Heathkit at the Swindon Museum of Computing. http://www.youtube.com/watch?v=wm8WtTRuE7Y Blog information can be found here : http://swindon.hackspace.org.uk/blog/heathkit-hero-printable-parts/ http://swindon.hackspace.org.ukYou should be able to print this without support.